Communications: electrical – Continuously variable indicating – With meter reading
Reexamination Certificate
2011-07-12
2011-07-12
Zimmerman, Brian A (Department: 2612)
Communications: electrical
Continuously variable indicating
With meter reading
C340S870010, C340S870090, C340S010100, C340S010200, C340S010300, C340S010400, C340S010500, C340S010600, C340S539310, C340S590000, C340S506000, C340S507000, C365S189120, C365S189020, C365S231000
Reexamination Certificate
active
07978095
ABSTRACT:
An integrated circuit includes an output pad, an alarm output pad, and a test mode output pad. A first multi-bit register is programmable to store programmable data such as data that identifies a customer for whom the integrated circuit has been manufactured. A second multi-bit register is programmable to store customer specified threshold data. A first circuit selectively couples the first and second multi-bit registers to the output pad. The first circuit is operable responsive to the integrated circuit being placed into a test mode to perform parallel-to-serial conversion of either the customer identification data stored in the first multi-bit register or the customer specified threshold data stored in the second multi-bit register and drive the converted data for output through the output pad. The integrated circuit further includes a tamper detection circuit operable responsive to the customer specified threshold data to generate a tamper alarm signal. A second circuit selectively couples the tamper alarm signal to the alarm output pad and test mode output pad depending on whether the integrated circuit is in a test mode. More specifically, the second circuit operates to drive the alarm output pad with the tamper alarm signal when the integrated circuit is not in test mode and drive the test mode output pad with the tamper alarm signal when the integrated circuit is in test mode (with the alarm output pad driven to a known state).
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European Search Report and Opinion for EP 06255930 dated Mar. 5, 2007.
McClure David C.
Saw Sooping
Wadsworth Robert
Benlagsir Amine
Jorgenson Lisa K.
STMicroelectronics Inc.
Szuwalski Andre M.
Zimmerman Brian A
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